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Thijske...My MainCoon View

THE FIRST CONVERTIBLE LENS TO BE OFFERED IN MODERN TIMES It is now possible to buy a fine modern convertible lens set. On a par with and following the tradition which started with the famous Protar made by Carl Zeiss, the Wisner Plasmat is a series of convertible lens sets which may be used in combination or singly to form different focal lengths of wide-field double- or long focus single-cell lenses. These "Convertible Plasmats" are grouped into four sets, complete with shutter and cell case and engraved brass table of f:stops. Each set is suitable for the standard formats of 4x5 (focal lengths of 152mm to 450), 5x7 (182mm to 500mm) and 8x10 (227mm to 600mm) and consists of five, five or four cells, respectively. Each set is capable of forming eight or more practical focal lengths in their respective ranges, resulting from the combination or single use of the various cells in each set, affording considerable savings in weight and expense.


 An example what can be done if you have patience and perseverance...

(If you don't mind to burn a few polaroid sheets :-) ) 

"Thijske" , my MainCoon by JD on Polaroid type 54 , Linhof Super Technika V.

Driebergen- The Netherlands 



Posted on Saturday, October 13, 2007 at 07:06PM by Registered CommenterJohn D in | Comments2 Comments

Reader Comments (2)

John that is one of the nicest cat images I've seen -- and I'm a Doberman owner :)

I have a Protar set (350 and 480) on a compound shutter. I shoot on 5x4 so most of what I do is enlarged but the quality is still remarkably good. Ole on http://www.largeformatphotography.info date mine to about 1928. The glass is so clear it seems as if it is not there.

When you use your set do you always place the single cell behind the shutter and is there any difference either way?

October 13, 2007 | Unregistered CommenterSteve Nicholls

Steve, thank you for your nice compliment.
This sure is something from a Doberman owner!
The cells should be placed behind the shutter. Actually I've never tried them in front, but it can be done.
The 350 and 480 combined would give a 245 mm and an image circle of 344 @ f:22


October 14, 2007 | Registered CommenterJohn D

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